Stepping motor automatic half current circuit

 Stepper motor to reduce the fever, will www.dongfeng-motor.com reduce the copper loss and iron loss. motor parts Reducing the copper loss is reduced, resistance and current requirements in the selection as far as possible choose small resistance and the rated current of the motor, but this often conflict with the moment and the requirement of high speed. For selected motor, first of all, should make full use of the drive of automatic flow control function and offline function, automatic half flow automatically reduce current when motor is static, offline function is to cut off the output motor current; Second, subdivision driver due to the current waveform is close to sine, less harmonic, electric heating will be less. To reduce iron loss associated with motor drive voltage, high voltage driver motor will bring high speed characteristics of ascension, but also bring the increase of the heat. We should choose the appropriate drive voltage grade, recommend suite, give attention to two or morethings stationarity and fever, such as noise indicators. 


To minimize motor sends, need TB6560 TQ2 and TQ1 pin level when the motor work is set to the maximum output current, the motor current in half or less when not working, so called "automatic half flow circuit". After the maximum output current, are defined with the NFA, NFB via TQ2 and TQ1 set current ratio of the output, is set fan motor to 00, 01, 10 and 11, the output current is the maximum current respectively 100%, 75%, 50%, 25%. Change of motor drive current, will change the size of the motor output torque. Automatic half flow circuit design with repeatable triggered monostable circuit chip 74 ch123, with motor drive pulse CLK as monostable trigger circuit. Monostable circuit reverse pick TQ2 output pin, when the motor driven lamination pulse TQ2 has kept a low level, no drive pulse maintain a high level. In figure 2 circuits, TQ1 connect three jumper cap. Connect a jumper wire 1, TQ2, TQ1 as high or low level all the time, drive current switch in 25% ~ 100%; Jump line 2, TQ2 is always low, current switch in 50% ~ 100%; After jump line 3, the current switch in 25% ~ 75%. Can choose different jump line according to the needs of work drive current.

3 okw motor, 380 v voltage. The power factor is 0.2, could you tell me how to calculate the rated current?

 Rated current I = P30KW U0.38 KV / 1.732 * * 0.2 = 227.9081 A, but electric motor 12v 500w 30 kw motor power factor can't be so low ah, do you want to calculate no-load running current of motor. The question you ask is problematic. ac three phase motor 30 kw motor power factor should be above 0.75. If according to the capacity of current rating: I = P30KW U0.38 KV / 1.732 * * 0.75 = 60.7755 A. Teach you two formula, very useful: "capacity divided by the number of kv, dealer by coefficient of seventh. "A kw, two current" can estimate the rated current of three-phase motor. Low power factor, then the acmotor2.blogspot.com motor should be banned the example of the net. Line current of three-phase ac asynchronous motor I material 2 P, P - power, kw. I material 2 x 60 kw motor current 30 = 60 a.

Trapezoidal wave commutation six

 Two way P - I controller output signal characterization of the voltage vector corresponding to the rotor. Corresponds to the motor current signal conversion, these static also after a series of reference voltage vector coordinate transformation, need the voltage control signal output bridge road. They first by rotor dynamic d - q reference structure is transformed into static x-y structure of stator. Then the voltage signal is again by the rectangular coordinate structure into the physical structure of the spacing between 120 degrees, then input to the motor of the U, V and W phase coil. This three-way voltage signal in the input generator set spare parts to the motor coil should be based on the PWM modulation. 

Of the time-varying motor coil current and the voltage wave signal is converted into d - q structure of dc signal's job is to reference coordinate transformation. Wave type change between the phase and the vector control is the essential difference between a series of coordinate transformation and handling of the current control. In string wave 3 phase induction motor type commutation mode, we need to change phase, then the string wave is obtained by wholesalemotor.blogspot.com P - I control electric current. So to control the system of P - I mainly deal with time-varying motor current and voltage wave signal, the performance of the motor is controller bandwidth and the phase drift limit. In vector control, current signal after P - I control first, then through high-speed phase of processing. Therefore, P - I controller does not need to deal with time-varying current and voltage signal; System is not subject to P - I bandwidth and the influence of the phase shifting controller.

Frequency conversion air conditioning inverter touch panel circuit analysis

IPM to work normally, besides the input dc 300 v power supply, each power unit must also be provided by the switch power supply circuit dc + 15 v working voltage and the trigger voltage. The principle of switch power supply, as shown in figure 8, IPM and switch power supply in a circuit board. In the switch tube components for IC11, for power triode. Switching power supply control for discrete component polyester packaging IC8, internal control for double circuit. Terminal 5, 6, as an independent of the secondary power supply circuit, voltage of + 12 v, the control voltage output. generator set spare parts The rest of the terminal for www.dongfeng-motor.com primary power supply circuit, oscillation and regulating role. 

Terminals for power supply side, and 300 v dc, terminal 1 for oscillation positive feedback input, performance value is + 12 v, terminal 2 for switch pulse output, performance value of + 6 v. Close analysis of the 3 phase induction motor circuit to refer to figure 7 can find some special points in the following: 1. The + 12 v power supply (cold) constitute a loop, and common used for sampling and main circuit power supply voltage control. 2. Eu and U power supply constitute a separate circuit, trigger control signal U. 3. The Ev and AC synchronous generator V power supply constitute a separate circuit, control signal V trigger. 4. Ew and U power supply constitute a separate circuit, control signal trigger w. 5. Power supply and dc re E N composition circuit, control signal trigger of x, y, z, because x, y, z three signal common dc re N.

The classification and characteristics of ac regulated power supply

Able to provide a stable voltage and frequency of power supply according to ac regulated power supply.At present most domestic manufacturers is the work done by ac voltage stability.Below the market some ac regulated power supply,the classification characteristics. motor vehicle spare parts Parameter adjustment (resonance):this kind of regulated power supply,voltage stability is the basic principle of LC series resonance,the early type of magnetic saturation voltage stabilizer is belong to this category.It has the advantage of simple structure,without many of the components,reliability is quite high ac electric motor voltage range is wide,strong anti-jamming and resistance to overload ability.The disadvantage is that large energy consumption,noise big,bulky and high cost.On the basis of the principle of magnetic saturation of development into the formation parameters voltage stabilizer and China have been popular in the 50 s of "magnetic amplifier gather digital ac voltage stabilizer" (614) are the principle of ac voltage stabilizer.Autoformer (than) gather: 1,mechanical pressure regulating type,i.e.,according to the servo motor to drive the carbon brushes in autotransformer winding sliding surface move,change Vo on the ratio of the Vi,in order to realize the adjustment of the output voltage and stability.

The voltage stabilizer can from several hundred to several kilowatts.It is characterized by simple structure,low cost,the output waveform distortion small; But because the carbon brush sliding contact are prone to edm,brush damage that burned and failure; Slow speed and voltage regulation.Type 2,change the tap,autotransformer to make multiple fixed tap,through a relay or SCR (SSR) as switch machine 10,automatically change the tap position,so as to realize the stability of output voltage.This type of circuit voltage regulator the method is simple,wide voltage stabilizing range (130 v to 280 v),high efficiency (95%) or higher,the price is low.While the disadvantage is that low voltage stabilizing precision (plus or minus 8 ~ 10%) working life is short,it is suitable for the family to the air conditioner power supply.Power voltage compensation type electrical motor - purifying type (including precise voltage stabilizer) it USES compensation link to realize the output voltage stability,easy to implement microcomputer control.It has the advantage of good anti-jamming performance,high precision voltage (+ / - 1%) or less,fast response (40 ~ 60 ms),simple circuit,reliable operation.


The disadvantage is that: with the computer,program-controlled switches,such as nonlinear load are low frequency oscillation phenomenon; Input side current distortion degree is big,the source power factor is low; The output voltage to input voltage phase shift.Against interference function to demand higher units,it is advisable to apply in the city,computer power supply,must choose the computer about 2 to 3 times the total power voltage regulator to use.Because has stabilized,anti-jamming,the advantages of fast response speed,moderate price,so widely used.Switching regulated power supply: it is applied to the high frequency pulse width modulation technology,and it is the difference between general switch power supply output must be with the input side of the same frequency and phase ac voltage.It had quasi square wave output voltage wave type,type of ladder wave,sine wave,etc.,in the market for uninterruptible power supply (UPS) from the storage power supplies and chargers,ac voltage regulator is a switch mode power supply voltage regulator and control function is strong,easy to realize intelligent,is a very promising ac regulated power supply.But because of its circuit www.facebook.com/dongfeng.motor is complex,the price is higher,so to promote more slowly.

Frost working condition

 (1) the frost starting single phase motor price conditions: outdoor heat exchanger tubes for less than 3 ℃ temperature of compressor running time reached more than 40 minutes. (2) the frost process: (1) compressor with a fixed 80 hz frequency operation. (2) the four-way valve, outdoor fan shut down. (3) the end of the frost conditions: (1) frost up to 10 minutes. (2) www.dongfeng-motor.com the outdoor heat exchanger copper tube wall temperature is higher than 5 ℃ (4) of the indoor and outdoor machine ac motor specification of communication. Indoor and outdoor machine USES asynchronous serial communication mode: indoor machine as the host, for outdoor communication lamination from the machine. 2 consecutive received exactly the same information is valid. Two minutes without communication or receiving signal fault, a fault alarm and shut down the outdoor and indoor fan.

IRMCF341 application on frequency conversion electrical appliances

 IRMCF341 application on frequency conversion electrical appliances, mainly aim at high functionality and save electricity. For example, requires higher than that of high speed, good control performance and www.facebook.com/dongfeng.motor small size light weight, large capacity, high comfort, long life, safe and reliable, mute, save electricity, etc. 341 is mainly used in permanent magnet synchronous motor, ac permanent magnet synchronous motor is a kind of can directly start up in the 50 hz three-phase alternating current environment of electric motor, its operation mode is: start asynchronous, synchronous operation. 

Ac permanent magnet synchronous generator set spare parts motor is rare earth permanent magnet materials to replace traditional electrical excitation and made of high efficiency and energy saving motor, it not only has general and permanent magnet motor has simple structure, reliable operation, the advantages of small fever, but also has small volume, light weight, low loss and high efficiency of marked characteristics, can realize the traditional electro-magnetic motor is 3 phase induction motor difficult to achieve high performance. Plus 341 based on FOC () field oriented vector frequency conversion control, sine wave driving mode for 180 degrees, more make it fully play at the same time, the performance of 341 USES electric resistance current sampling refactoring techniques, save the cost and single resistance current sampling reconstruction technology refers to the current 341 use current PWM corresponding state, use appropriate delay time (avoid current oscillation) can collect the real bus current, will to many times current restructuring in the PWM timing can be three phase current.

Three-phase no-load current of 2.5 0.75 KW motor,what reason be

Two 0.75 KW..Grade 4...380 v...The motor..No-load current is between 2.3 to 2.6...Work environment textile factory..'a lot...Rated current of the motor is only 2.2...Normal no-load current is around 1.6..Time machine completely under ac electric motor the condition of no load over current...Due to the current big.So high temperature sharply born..Will soon..Overheating damage..Do not say the reason...thank you Problem complement: I thank two answer first..Disease,and together,the two are not normal before..In a few years later.You'll find the bad one current is increased.[.Repair of the motor are friends.Eliminate offline ribbon..] ...Until now,with or without load..Motor current wholesalemotor.blogspot.com is bigger...Last year when the motor current in 2.0 A..Now 2.4-2.5 A...Motor shaft sleeve inside and outside in good condition...Have not completed...Don't go...Only electricity pilot time to run the old hot..Often the temperature in the 60-80 degrees...Wiring is right...Are the normal installation... 


There is a reason,is you pick the wrong wiring.380 v y connection.You make into 380 v delta connection.So,motor heat quickly.This is one magnetic generator of them.In addition,the machine is idle for a long time,must have certain load.If it is in use for a period of time after the scenario (excluding intervention had gone wrong),should be the result of mechanical failure.1 bearing damage increase torque resistance.Run 2 bearing outer ring,which leads to the bearing wear gaps (cover),the rotor eccentricity running and friction with the stator (boring),increase the electric motor 12v 500w torque resistance.What type of your motor,then measure the core size,what are you friends with line,around a few laps? I help you check it.Is estimated to be between winding insulation damage,it is recommended that you access the winding.

Dc braking principle

Dc braking principle. When asynchronous motor stator winding zhongtong into direct current, the magnetic field generated by the constant magnetic field will be the space www.facebook.com/guohong.trading position unchanged, and the speed of the rotor because of its inertia continues with its original spin, at this point, the rotation of the rotor cutting the static magnetic field and produce brake torque, system stored kinetic energy is ac motor converted into electrical energy consumption in the rotor circuit of the motor, thus to achieve the effect of fast brake motor. In order to guarantee the safety of the motor, dc brake is best used with braking energy. Inverter dc brake setting, dc fan motor brake basically set the following three contents 2.1, started to dc brake starting frequency 2.2, applied to the stator winding voltage dc brake. As a result of the stator winding dc resistance is very small, so lamination the dc brake voltage adjusting range is usually the circuit dc voltage of the 0 ~ 10%; 2.3, the braking time. Braking time impossible and actual braking time coincide, in order to ensure the braking effect, usually set slightly larger;

Multimeter application tips measuring three

Measuring the zener diode: we usually used regulator tube voltage value is generally greater than 1.5 V,and pointer table R x 1 k resistance is to use in the table below 1.5 V batteries,so,measured with resistance R x 1 k under voltage regulator tube like measuring diode,with full of unidirectional conductivity.But the R x 10 k file pointer motor magnet table is made of 15 v or 9 v batteries,with R x 10 k test voltage value is less than 9 v and 15 v voltage regulator tube,reverse resistance would not be up,but has a certain value,but the value is significantly higher than that of positive resistance regulator tube.So,we can preliminarily estimate the stand motor run capacitor or fall of voltage regulator tube.But,good regulator tube have a precise voltage value,amateur conditions how to assess the voltage value? 

Is not difficult,to find a pointer table is ok.Method is: put a watch at first R x 10 k file,the black,red pens and respectively in the cathode and anode voltage regulator tube,then simulate the electrical motor real working state of the voltage regulator tube,then take another watch on voltage profile V x 10 V or V x 50 V (according to the regulated value),will be red,black pens and respectively by receiving the watch just now black,red pens and,at this time to measure the voltage value is basically the voltage value of the voltage regulator tube.Said "basically",because the first block of the voltage regulator tube bias current relatively normal when using the electricalmotor1.blogspot.com offset current is a bit smaller,so the measured voltage value is slightly larger,but the basic.This method can only estimate voltage value is less than the pointer table high voltage battery voltage regulator tube.If the voltage value of the voltage regulator tube is too high,can only use plus method to measure the power of the (so,when we choose a pointer table,choose high voltage battery voltage is 15 v more applicable than 9 v).

Ac voltage measurement

In order to grasp the change situation of IC ac signal,can be used with the dB jack multimeter ac electric motor 12v 500w voltage electrical motor 24v to approximate measure of IC.Detection multimeter under ac voltage blocking,pens and insert the dB jack;For no dB jack multimeter,need in pens and concatenated a 0.1 ~ 0.5 u F condenser.The method is suitable for the working frequency is low IC,such as television video amplifier stage,field scanning circuit,etc.Due to acmotortrading.blogspot.com the inherent frequency of the circuit,waveform is different,so the measured data is an approximation,for reference only.

With further narrowing the scope of the fault test method

 The appearance inspection found no fault point,can according to the fault phenomenon,combined with the circuit diagram analysis of the cause of the problem,permanent magnet motor in expanding the scope of the fault,damage under the premise of electrical and mechanical equipment,direct current experiments,or remove load (off) from the control box terminal plate electric test,in order to distinguish the fault may be in electrical parts and machinery,and other parts;Is on the motor and control equipment;Is in the main circuit and control circuit such as contactors and motor movements,the fault in the main circuit;If contact not suck,fault in the control circuit.Usually check control circuit,particular way is: a button or switch operation,circuit in motor run capacitor the contactor,relay will take place according to the order of the work.If,in turn,moves to a certain electrical components,found that do not conform to the requirements,both show that the electrical components or the relevant circuit has a problem.In this circuit,item by item analysis and check again,usually can find fault.

To control circuit  troubleshooting back to normal again after turn on the main circuit,check the main circuit of the control effect,to observe the performance of the main circuit with and without exception,etc. In the current test,must pay attention to personal and electricalmotor1.blogspot.com equipment safety.To abide by rules of safe operation,shall not touch the live part,as far as possible to cut off the electric power main circuit,only under the permanent magnet generator condition of the electric control circuit for inspection;For motor operation,should make the motor under no-load operation,to avoid the movement of industrial machinery parts misoperation and collision;To temporarily partition defective main circuit,in order to avoid failure,and fully estimated in advance to the local line movement after the possibility of adverse consequences.

Machine tool equipment electrical troubleshooting,repair and matters needing attention

When find out the fault point electrical equipment,will begin to repair,commissioning,records,etc.,and then consign is used,but must pay attention to the following items:1.Find out the fault point and repair failure,can't find the fault points should be paid attention to as a search for the end of the fault must be further find out the root cause of the failure analysis.2.After find out the fault point,must according to different fault condition and the location corresponding to the correct repair method.3.In the repair work of fault point,under normal circumstances should electrical motor try to be recovered.4.Electrical fault repair finished,need electricity commissioning,cooperate with the operator,to avoid new failures.5.Every time after troubleshooting,should be timely sum up experience,and completes the maintenance records.

Records include: industrial machinery model,name,number,generator generator set the date of the failure,failure phenomena,parts,damage of electric appliance,the cause of the problem,after the repair measures and repair operation,etc.Record purpose: as a file as a reference for future maintenance,and through the analysis of all previous failures,take the corresponding effective measures to prevent similar accidents from happening again or improvements for the design of the electric equipment itself,etc.There is a bridge to communicate at a factory crane (model: PQR6-100 s capacity of 5 t),in operation,the crane upgrade machine (model: YZR225M an 8,2 kW) abnormal whistlers.Judgment is a gasoline generator mechanical failure at first,then check the gear bearing and gear shaft,result in good condition,will load disconnect,the motor idling,screaming.


Judgment is to slow down the helical shaft bending in the cabinet,check the deviation within the rules.In desperation,the collapse of the motor,the motor is in good condition,core without friction marks,check the collector ring and brush.Resistance box (resistance box for wound rotor concatenated variable resistance) are in good condition.Disconnect the wound rotor of variable resistance,electric test,squeaking wholesalemotor.blogspot.com noise elimination.Prove that the motor is on the rise,the variable resistance of the rotor circuit concatenated resection,relay is measured with table,found that dc delay relay (T3-11/1-110 - v) normally closed contacts ILSJ (circuit as shown in figure 1) death.If it can't disconnect in time,as the grab rose control variable resistance of ac contactor coil 1 JSC,3 JSC,SJSC suction,the main contactor 1 JSC,2 JSC,JSC all closed,wound rotor concatenated variable resistance of all the work.Replace the dc timing relay,fault be ruled out.

watt

 The power unit of the international system of units.Watt is defined as 1 joule per second (1 j/s),namely every second transformation,use or dissipation (in the) of joule for measurement of the rate of energy. In the electrical electric fan motor system of units,the volt by ampere (V (A).More commonly used in everyday life-kw as a unit,1 mw = 1000 watt.Unit conversion: watt by a British scientist to make a significant contribution to the development of the steam engine was named after James watt.The name of the entity in the first 1889 adopted by the 2nd meeting of the British association for the advancement of ac induction motor 110kw science.In 1960,the international conference on measurement 11th meeting in watts of power in the international system of units (units.People commonly used power unit multiplied by the unit of time to represent the energy.For example,1 kw? R is a power of 1 kw of energy consumed energy wholesalemotor.blogspot.com consumption equipment in 1 hour,is equal to 3.6 million joules.The commonly used formula W = UIT; W = P * T Network watt is small electric motors English words on the water (water).Such as the brain watt,it means that thinking."W" and "bad" in the Shanghai dialect pronunciation similar.

Pump and fan - reciprocating pump

Now with piston type as an example to illustrate its working principle.As shown in figure 1,permanent magnet motor 7,piston pump is mainly composed of a piston in the pump cylinder for reciprocating motion within 2 to 1 liquid inhalation and ruled out.When the piston 1 started from the far-left side to the right position,studio 3 volume gradually expand,indoor pressure is reduced,open fluid suction valve 4,into the piston 1 release space,until motor run capacitor l piston moves to the far end of the process for the pump suction process.When the piston 1 right from the beginning,the move to the left side of pump fluid by squeezing,close the valve on the electricalmotor1.blogspot.com suction,pressure and open the water valve 5 and discharge,this process is called process of pressurized water pump.Piston reciprocating motion,the suction of the pump is continuously alternating with pressurized water process.The motor magnet pump working principle is actually like the compressor refrigeration system,so we are not in this explanation,and behind the compressor parts in detail.This pump is suitable for small flow,high pressure,in a large refrigeration unit used more.

The application of squirrel-cage asynchronous motor soft starter - working principle of the soft starter

Soft starter is a collection of soft start,soft stop,light load energy saving motor parts and multi-functional protection of motor control device.It not only realize no impact in the whole process of starting and smooth starting current,and according to the characteristics of the motor load to adjust the parameters in the process of starting,such as current limiting value,starting time,etc.In addition,it also has the protection of motor function,that is fundamentally solves the disadvantages of traditional step-down starting equipment.Soft starter used three opposite parallel thyristor as a voltage regulator,to wear it while plugged motor run capacitor into a power supply and the motor stator.

This circuit such as three-phase fully-controlled bridge rectifier circuit,main circuit diagram as shown in figure 1.When using the soft starter motor,the output of the thyristor voltage increase gradually,motor speed gradually,until the thyristor conduction,all motor electricalmotor1.blogspot.com working in the rated voltage on the mechanical properties of smooth start,reduce the starting current,avoid start over-current trip.For motor to achieve rated speed,the end of the boot process,the soft starter automatic bypass contactor to replace has completed the task of thyristor,provide the rated voltage for the motor magnet motor operation,to reduce the heat loss of thyristor,prolong the service life of the soft starter,improve the work efficiency,and make the power grid to avoid the harmonic pollution.Soft starter and also provide function of soft parking,soft parking,in contrast to the soft start process,voltage decreases gradually,speed gradually decreases to zero,to avoid the free parking torque caused by the impact.

Electric welding machine before use should be paid attention to what issues?

Electric welding machine of new or unused for a long time,often due to be single phase generator affected with damp be affected with damp between winding,winding and reduce insulation electric fan motor resistance between the casing and likely to occur at the beginning of the use of short circuit and grounding,equipment and personal accident. So before using shaking table to check whether the insulation resistance of qualified application.Before starting a new welder,should check electrical system contactor parts are in good condition,think after normal,may be started under no-load test run. IE2/IE3 electric motor Prove that no electrical hazards,after the load cases,finally can run normally.Dc arc welding machine should be wholesalemotor.blogspot.com in accordance with the direction of rotation,attention should be paid to the fan with the ventilator on direction of rotation is correct,blown out by the above should be used. In order to achieve the purpose of cooling welder.

Pump and fan - the working principle of the centrifugal pump and fan

Working principle of the centrifugal pump and fan is generated when the high-speed rotating impeller centrifugal force electrical motor makes the fluid gain energy,namely the fluid through the impeller,the pressure energy and kinetic energy are improved,so that they can be transported to the height or distance.The centrifugal pump and fan the simplest structure as electricalmotor1.blogspot.com shown in figure 1,2,as shown in figure 1-3.L impeller in a spiral shell,when diesel generator the impeller rotates,fluid axial flow,and then turn 90 degrees into the diesel generators prices impeller passage and radial flow.Continuous rotating impeller,the impeller entrance constantly forming a vacuum,so that the fluid continuous pump suction and discharge.

Transformer fault analysis and processing - high voltage transformer common fault reason analysis

Due to manufacturing quality aspects of problems in oil storage tank,and sealed,leading to the insulation fault and could explode,in some oil storage on the ark cover plate thinner,poor welding,flange gasoline generator box along a thin,wide pitch and fine processing technology is not the faying surface rough inequality. In addition,if you use the sealant mat quality is bad,after long-term use of metamorphism and lose elasticity,even and crack,caused by leakage and be affected with damp be affected with damp.Moisture absorption device installation is unreasonable,if disrepair,silica gel,when humidity increase temperature mutations,moisture will enter the transformer,the insulation,water enters the body breakdown caused by water.Body design,selection of materials and processing technology,the existing problems,such as more than 110 kv voltage transformer,the enameled wire,some winding process is lax,deformation,coil turns overlapping,when winding motor run capacitor tightness is differ,or layer insulation thickness,could produce layer or interturn short-circuit cause transformer explosion.

Choose the material quality is bad,if 220 kv capacitor type current transformer structure,selection of cable if poor insulation performance is easy to cause trouble,and support such as voltage transformer insulation board selects absorbent material is big,and not through immersion oil processing,insulation performance is poor,also easy to cause breakdown caused by the fault.12v motor Voltage transformer body support plate quality bad,runtime craze,partial discharge and then extended to breakdown in pairs.Cascade type voltage transformer iron core structure has defects,the clamping screw have suspended potential or spiral Angle caused by partial discharge;With double core voltage transformer,such as the spacing between the two core is not enough,can also cause climb lightning collaterals cause faults in the operation.Transformer terminal derivation of the leakage of oil or leading-out terminal acmotortrading.blogspot.com board insulation fault may cause failure.Transformer fault in addition to manufacturing,material selection,design and test report lax wait for a reason,and operation maintenance is not timely,also found that the problem could not handle in time,have a direct relationship and disrepair.

What is the meaning of power rating?The input power is what mean?

Would be rated power 100 w, 100 w?electric vehicle motor The input power of 350 w is must be 350 w?The input power, is the ac electric motor electric power consumed. Rated power generally refers to the effective power of the electrical appliances can be continuous output;Which is under normal working conditions electricalmotor1.blogspot.com the maximum power of can continue to work.

More than 110 kv transformer fault processing method

110 kv and above defective transformer.Treatment methods mainly include core inspection,repair,replace the seal leakage,oil change,vacuum drying,structure improvement,etc.For body slightly and can only deal with at the scene of be affected with damp be affected with damp,generally USES the vacuum hot oil circulation processing,after the hot oil into electrical motor the transformer,heat insulation,its internal moisture will evaporate,and filter oil machine from transformer top discharge,through continuous loop to achieve the purpose of drying. Using vacuum drying process be affected with www.facebook.com/guohong.trading damp be affected with damp,body,vacuum to remain above 750 MMHG column,after the body into the chamber,from low to high temperature to increase slowly.


When temperature 40 ℃ drying 48 h,48 h,to 60 ℃ drying to 75 ℃ in 48 h,finally to 95 ℃,the insulation resistance should detect every hour,when its value in 6 ~ 8 h remain unchanged or changed little,the vacuum drying.Practice has proved that the chamber upper and lower temperature regulation in 10 ℃,the best drying effect,should pay attention to is asynchronous motor in the process of drying to prevent seal heat aging,to them,and put an end and the secondary outlet end of the small porcelain set loose.On the oil storage tank sealing and sealing capsule quality is poorer,can be equipped with corrugated expansion method is used to change the sealing performance; To secondary board be affected with damp be generator generator set affected with damp in the tg of the delta slants big,can replace the original secondary wiring board,change the way to solve small secondary outlet casing.

Squirrel-cage asynchronous motor soft starter application - soft starter start,stop,features

Total pressure for water pump type load,motor starter,water,will be in a very short period of time to full speed in case of pipe bend,high-speed flow impact on the pipe wall,make a big impact,the formation of water hammer effect,can damage piping.If the water pump in front of the line is longer,when sudden stop water pump motor,high speed water flow will impact to the pump impeller,produce very big impact,can make the impeller deformation or damage.Shandong plant no.1,no.2 water pump room,undertake the task motor magnet the seepage discharge of underground powerhouse.Water pump room 1 6 motor rated power is 110 kw,the rated current of 202.2 A;2 water pump room 3 motor rated power is 75 kW,rated current 140 A.In the operation of the pump in the problems are: 1,overhaul of deep well water pump room of no.generator generator set 1,due to stop when the pump water hammer is too big,the original cast iron check valve blowout,now although change slow close check valve,alleviate the water hammer effect,but the water hammer will damage to the motor brake non- return plate.


2 water pump room 2 low pressure pump,water hammer effect makes the pump impeller damage.In April 2005,shandong factory for no.1,no.2 water pump room 9 pump control system is reformed,change from the previous relay control system to the programmable controller to control.Water pump motor for direct starting before modification,and electricalmotor1.blogspot.com now with ABB PST the soft starter.Through to the soft starter motor Settings of various parameters get better starting performance.Booster time: 3 s,starting voltage: 60%,current limiting multiples: 4 ie.Motor starting,the starting voltage 60% Ue,when four times starting current to rated current,output electrical motor voltage stability,until reduced to limit the following current,boosting process will continue,ensure the starting current is always less than 4 times the rated current,as shown in figure 2.Pump shut down,the water hammer effect caused by noise,vibration,often appear non-return valve fracture,short service life of pump pipeline rupture of fault,even the most difficult problem in the water supply system is the damage when the pump stop water hammer,soft starter excellent soft stop function is fundamentally solve this problem.Through to the soft starter Settings of various parameters to make the pump to obtain better braking performance.Decompression time: a t1 t2 = 3 s,end voltage: 60% Ue.

The structure and working principle of electromagnetic ac contactor

 Structure:(1) the contactor is mainly com posed of electromagnetic system,contact system,arc extinguishing system and other parts.(1) the electromagnetic system:electromagnetic system,including electromagnetic coil and core is an important component of the contactor,rely on it to drive the contact closing and opening.electric fan motor (2) contact system:contact with the executive branch of contactor,including main contact and auxiliary contact.The role of the main contact is switched on and off the main circuit,control a larger current,and the auxiliary contact is electric motor 12v 500w in the control circuit,in order to meet the requirements of various kinds of control mode.

(3) arc extinguishing system:arc extinguishing device to ensure off contact circuit,the electric arc reliable quench,reduce arc of contact damage.In order to quickly extinguished disconnected arc,contactor usually equipped with arc extinguishing device,generally USES half a longitudinal seam sealing clay arcing cover,with a ac induction motor 110kw strong magnetic blast circuit.(4) other parts:the insulation shell,spring,short circuit ring,transmission mechanism,etc.(2) working principle:when the electromagnetic coil is not energized the contactor,wholesalemotor.blogspot.com spring reaction force and bit core of gravity to keep main contact disconnected position.When the electromagnetic coil through control circuit on the control voltage (generally rated voltage),the electromagnetic force to overcome the spring inhale armature reaction to the static iron core,drive the main contact closure,processing circuit,auxiliary contacts with the action.